SU2530A1 - Firebox with chain grille, inclined pre-furnace grates and a separate ceiling vault for burning low-grade coal - Google Patents

Description

In order to achieve the most favorable conditions for burning low-grade coals on the chain grill and to achieve uniform combustion, it is proposed to use a grate inclined grate pushed deep into the furnace and provided with a ledge in the middle and a horizontal canopy, composed of ends of the grate of different lengths, and a hollow arch of the discharge end. firebox with additional air supply to the stream of hot gases. FIG. 1 shows a longitudinal vertical section of the proposed topky; in fig. 2 is a sectional view of the firebox along line 1-J of FIG. one; in fig. 3 is a sectional view taken along line 2-2 of FIG. 1 pre-furnace space; in fig. 4-front external view of the firebox; in fig. 5- front view of the split arch; in fig. 6 is a sectional view and a plan view of a modified pre-furnace device and in FIG. 7 is shown in the plan and in the side view of the hole grate plate. Directly inside the furnace (Fig. 1) above the chain grille / a small fixed grille is installed, consisting of individual grates a, b c. one small step in the middle and with a lower step c, having a greater width, located directly above the chain grille /. Due to the deviation of the grill relative to the edge of the lower step, a significant uniform layer of burning fuel is found underneath a layer of raw fuel running over it; in this case, the inclined grate works as an ordinary horizontal grate when manually throwing coal over the burning layer. At the lower stage, the inclined lattice has significant openings and slots allowing free passage of hot coals and hot ash to the inclined lattice onto the chain lattice canvas. The pre-furnace is located inside the furnace, directly in the main gas stream at the gas window, which enhances the action of the pre-furnace and, thus, drying, sublimation and ignition of the fuel is intensive, despite the small size of the grid. Above the upper end of the inclined grate is an inclined gate e of the loading bucket s, with the help of which the adjustment of the thickness of the loading layer is carried out. The lower step from the lattice is under the fuel layer and the protruding ends of the grates have different lengths and different gaps between them, which results in grinding of the incoming upper. layer of fuel and the forced uniform exhaust of fuel "3 pre-furnaces by friction of the chain grille. The observed phenomenon of rapid ignition of fuel at the walls of the fire chamber in their heated state is used by the fact that several cast-iron d, L partitions are installed in the middle of the pre-furnace, which, burning from bottom burning, accelerate the ignition of the incoming fuel and, moreover, due to friction against these partitions different speeds of movement of the fuel layer along the grid are obtained. In the brickwork of the pre-furnaces, side cast-iron plates are installed (fj, to prevent the apparel from sticking and drawing the coal to the masonry). the inclined sieve is pushed into the furnace space, the rhenium is removed from the drive mechanism of the chain grille and from the box and the speed input. The rear arch of the furnace has a double view of h, Ji, the arch separated channel serves to divert products from the end of the grill In addition to the channel of the jet of this additional eye, perpendicular to the movement of gases in the main gas window, along the channel of the gas in the main gas window, when burning at the end of the grate, a large excess of air goes before the burner and for heating the combustion products they are directed along inclined canals of the visor, which due to the parallel arrangement over the moving grating, it contributes to the process of drying and sublimation of the coal sliding on the pre-furnace. The thickness of the fuel layer on the chain grille is established by the protruding edge of the lower stage, while the length of the nozzles of the lower grates establishes the surface relief of the coal on the chain grille so that in the middle of the grate a layer is deepened and the edges are thickened to lattice along the straight line, not zyko.m. With heavily fluctuating grades of fuel, by size, it is necessary to have a wider adjustment of the layer thickness and with a large difference in humidity and ash, in addition, it is necessary to accelerate the action of forced stirring, cutting into piles, as well as to maintain a uniform regular surface relief of the layer along the chain lattice without breakage. For this purpose, a movable lower comb consisting of individual cast-iron plates lying directly on the chain grate is installed instead of the lower stage of the inclined pre-furnace. These plates (Figs. 6, 7) have round holes for the passage of air and are fixed each separately at the outer front of the pre-furnace with a separate rod. Thus, the lower stage of the pre-furnace is replaced by plates i lying on the chain grid and having bends at the ends upwards to increase the friction between the moving fuel layer and the plates. The surface relief of the layer on the grille Allows changing as the grill progresses, during combustion (in the event that the grade of fuel changes), by moving individual elements of the lower stage deep into the chain grille or back. Due to the distance between the plates, their ends may protrude from the line of repose of the fuel without increasing the thickness of the layer on the grid. SUBJECT OF THE PATENT. 1. Firebox with chain grille, inclined pre-furnace grates and a separate ceiling vault, for burning low-grade coal, characterized with cumulative use: a) an inclined grille and c (figs. 1–3) from the grid-irons with hook-shaped ends C of different lengths, located with a certain ledge under the sheet e of the chain hopper /; oj of a separate arch ft, located above the chain grate and provided with openings and a channel for exhausting gases from the end of the lattice and introducing them into the common stream of combustion products, and c) a number of partition walls L and end shields i / i placed at the ends and between p These are inclined grates, in order to separate the total flow entering the combustion chamber of coal into a number of narrower flows using more vigorous combustion near the separation grids. 2. Modification of the furnace described in paragraph 1, characterized in that the permanent hooked ledges from the inclined grates are replaced by adjustable holed wheel plates fc-g with a threshold w (Fig. 6) at the end, which plates rest on the grate of the chain grid and can be optionally shifted, in order to increase or decrease, not following the movement of the chain grate, of the coal foci.

Tipo-Pitograph “Red Pechatnik, Leningrad, International, 75.

Npatent M530

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